7-24
CHAPTER 7
Typically electrons
fl
ow from the anode (the aluminum drive unit),via
the external conducting path to the cathode (stainless steel propel-
ler). If there is a very large anode connected to a small cathode, the
anode will corrode very slowly. If a very large cathode is connected
to a small anode, the anode will corrode very quickly. Obviously, if
you do not control galvanic corrosion, over time the aluminum will
corrode away.
The
fi
rst sign of galvanic corrosion is paint blistering (starting on
sharp edges) below the water line- a white powdery substance forms
on the exposed metal areas. As the corrosion advances, the exposed
metal will become deeply pitted as the metal is actually eaten away.
Another condition which will increase galvanic corrosion is the re-
moval or reduction in surface area of the sacri
fi
cial anodes. Never add
aftermarket products that are connected to the engine ground such as
stainless steel steering aids and trim planes.
Zinc connected to aluminum will form a corrosion cell but the alumi-
num (drive) becomes the cathode and the zinc (anode) corrodes.
Even though your boat may not have shore power aboard current
from nearby vessels with shore power can produce stray current gal-
vanic corrosion. Stray current corrosion occurs when metal with an
electrical current
fl
owing into it is immersed in water that is grounded
(lake, ocean, pond). The current can leave the metal and
fl
ow through
the water to ground. This will cause rapid corrosion of the metal at
the point where the current leaves.
When a vessel nearby is plugged into shore power, they can poten-
tially tie your outboard drive unit to their boat via the green grounding
shore power lead. Your outboard drive unit could be the receiving end
of a large galvanic cell (a battery) interconnected with nearby vessels
or even through the marina’s metal structures via their electricial sys-
tem.
Summary of Contents for 23 OBX
Page 1: ...OWNER S MANUAL 23 OBX...
Page 2: ...REGAL 221734 OWNER S MANUAL 12 2015 23 OBX...
Page 7: ...INT 7 Introduction THIS PAGE IS LEFT INTENTIONALLY BLANK...
Page 18: ...INT 18...
Page 38: ...1 16 CHAPTER 1 NAVIGATION LIGHT RULES...
Page 41: ...1 19 Safety On Board...
Page 83: ...CHAPTER 3 3 16...
Page 142: ...Equipment Operation 6 3 Standard Battery Switch Circuitry Front View...
Page 143: ...CHAPTER 6 6 4 Standard Battery Switch Circuitry Rear View...
Page 145: ...CHAPTER 6 6 6 Dual Battery Switch Circuitry Front View...
Page 146: ...Equipment Operation 6 7 Dual Battery Switch Circuitry Rear View...
Page 151: ...CHAPTER 6 6 12 TYPICAL TONNEAU BOW COVER BOW COVER COCKPIT COVER...
Page 152: ...Equipment Operation 6 13 CANVAS TRAVEL COVER...
Page 168: ...Equipment Operation 6 29 Typical Hinged Power Tower Actuator Hydraulic Ram Typical Power Tower...
Page 236: ...CHAPTER 9 Notes...
Page 265: ...12 11...
Page 267: ...12 13 STEREO PERFORMANCE PACKAGE HARNESS RUN...
Page 268: ...12 14 FUSE BLOCK OVERVIEW...
Page 269: ...Technical Information 12 15...
Page 270: ...12 16...
Page 271: ...Technical Information 12 17...
Page 272: ...12 18 TYPICAL DASH WIRING WITH GARMIN 7606...
Page 273: ...Technical Information 12 19 TYPICAL DECK HARNESS BREAKOUTS...
Page 275: ...Technical Information 12 21 TYPICAL DECK HARNESS OVERVIEW...
Page 276: ...12 22 TYPICAL GARMIN YAMAHA NEMA 2000 NETWORK...
Page 282: ...12 28 Sea Star Hydraulic Assisted Steering System Typical Helm Layout...